On Tue, 11 Mar 2025 15:51:41 +0800 Yicong Yang <yangyic...@huawei.com> wrote:
> From: Yicong Yang <yangyic...@hisilicon.com> > > On building the topology from the devicetree, we've already gotten the > SMT thread number of each core. Update the largest SMT thread number > and enable the SMT control by the end of topology parsing. > > The framework's SMT control provides two interface to the users [1] > through /sys/devices/system/cpu/smt/control: > 1) enable SMT by writing "on" and disable by "off" > 2) enable SMT by writing max_thread_number or disable by writing 1 > > Both method support to completely disable/enable the SMT cores so both > work correctly for symmetric SMT platform and asymmetric platform with > non-SMT and one type SMT cores like: > core A: 1 thread > core B: X (X!=1) threads > > Note that for a theoretically possible multiple SMT-X (X>1) core > platform the SMT control is also supported as expected but only > by writing the "on/off" method. > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/ABI/testing/sysfs-devices-system-cpu#n542 > Reviewed-by: Pierre Gondois <pierre.gond...@arm.com> > Reviewed-by: Dietmar Eggemann <dietmar.eggem...@arm.com> > Signed-off-by: Yicong Yang <yangyic...@hisilicon.com> Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>
